Example of UNWRAP Operator - SQL

Example here shows how unwrapping can be done in longhand in SQL.

Example: Unwrapping in SQL

Letting CONTACT_INFO_WRAPPED denote the result of Example:

SELECT Name,

Address.House as House,

Address.Street as Street,

Address.City as City,

Address.Zip as Zip

FROM CONTACT_INFO_WRAPPED

Address.House in this example is equivalent to Tutorial D's House FROM Address. The use of a dot here is consistent with its use with range variables-recall that a range variable also denotes a row, "ranging" over the rows of a table.